Decomposition of Organic Matter from Wastewater Using Ti/IrO₂-RuO₂ Coated Electrodes: Electrode Characteristics and Removal Efficiency

Abstract

In this study, the preparation characteristics of coated electrodes were used to remove organic matter from wastewater. The effects of low concentration range in different current densities and pH on the removal of organic substances, chemical oxygen demand (COD) and ammonia nitrogen (NH 3 -N) by the coated electrode were explored. The experimental results indicated that the removal efficiency of NH 3 -N and COD achieved the optimum value when the electric current density was 8-10 mA/cm 2 , the pH value was mild alkaline or neutral, and the electrolysis time was about 30 min. The preparation process of coated electrode and the mechanism of degradation of organic matter in wastewater were investigated. The coated electrode was analyzed by blending Energy Dispersive X-Ray (EDX) and Scanning Electron Microscope (SEM). The results indicated that the titanium-based ruthenium coated electrode was more suitable for practical application.